Enhancement of unidirectional forward scattering and suppression of backward scattering in hollow silicon nanoblocks

Manipulating the light scattering direction and enhancing directivity are important research areas in integrated nanophotonic devices. Herein, a novel, to the best of our knowledge, nanoantenna composed of hollow silicon nanoblocks is designed to allow directional emission manipulation. In this device, forward scattering is enhanced and backward scattering is restrained substantially in the visible region. Owing to electric dipole resonance and magnetic dipole resonance in this nanoantenna, Kerker's type conditions are satisfied, and the directionality of forward scattering <i>G</i>_{<i>F</i><i>B</i>} reaches 44.6 dB, indicating good characteristics in manipulating the light scattering direction.